* libc/stdio/vsprintf.c (vsprintf, _vsprintf_r): Set _file fd to
-1 to be sure it cannot later match a valid file fd causing
isatty() to return 1.
* libc/stdio/asprintf.c (asprintf, _asprintf_r): Ditto.
* libc/stdio/sprintf.c (sprintf, _sprintf_r): Ditto.
* libc/stdio/vasprintf.c (vasprintf, _vasprintf_r): Ditto.
* libc/stdio/vprintf.c (vprintf): fix signature to use _DEFUN
* libc/stdio/vprintf.c (_vprintf_r): new function
* libc/stdio/vsnprintf.c (vsnprintf): fix signature to use _DEFUN
* libc/stdio/vsnprintf.c (_vsnprintf_r): fix signature to use
_DEFUN, and call _vfprintf_r, not vfprintf.
* libc/stdio/vsprintf.c (vsprintf.c): fix signature to use _DEFUN
* libc/stdio/vsprintf.c (_vsprintf_r): fix signature to use
_DEFUN, and call _vfprintf_r, not vfprintf.